Download MendeleyThe Organization of Divalent Cations in the Active Site of Cadmium Escherichia Coli Fructose 1,6-Bisphosphate Aldolase
Hall, D.R., Kemp, L.E., Leonard, G.A., Marshall, K., Berry, A., Hunter, W.N.(2003) Acta Crystallogr D Biol Crystallogr 59: 611
- PubMed: 12595741
- DOI: https://doi.org/10.1107/s0907444902023661
- Primary Citation of Related Structures:
1GYN - PubMed Abstract:
Previously determined crystal structures of the zinc enzyme Escherichia coli class II fructose-1,6-bisphosphate aldolase display good agreement for the protein structure but a differing metal-ion organization in the active site. The structure of the enzyme with Cd(2+) in place of Zn(2+) has now been determined to 2.0 A resolution to facilitate cation identification. The protein structure was essentially identical to other structures and five Cd(2+) positions were identified. Two of the cations are at the active site; one corresponds to the catalytic ion and the other provides a structural contribution. These Cd(2+) sites are equivalent to two Zn(2+) ions observed when the enzyme is complexed with a transition-state mimic and confirm our assignment of the roles played by these ions.
Organizational Affiliation:
Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland.
